Pulsator for pulsatory tools.



' L. 0.. BAYLES;

PULSATOR FOR PULSATORY TOOLS.

APPL1CAT10N FILED SEPT. 25. 1913.

1,191,757. Patented July18, 1916.

2 SHEETS-SHEET I.

W/T/IIESSES: INI/ENTOR CM W QM M Q Q8214. QM x. 04 41 4 1 BY A TTORNEY UNITE as LEWIS CONDICT BAYLES, 0F EASTON, PENNSYLVANIA, ASSIGNOR TOINGERSOLll-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION 01; NEW JERSEY. I

PULSATOR FOR PULSATORY TOOLS.

Specification of Letters Patent.

Patented July 18, 1916.

Application filed September 25, 1913. Serial No. 791,712.

To all whom it may concern Be it known that I, LEWIS C. BAYLES, a citizen of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Pulsators for Pulsatory Tools, of whichfthe fol lowing is a specification.

This invention relates to pulsators for pulsatory pneumatic tools and more particularly to a pulsator for high speed tools operated by fluid pulsations in a single hose.

The object of this invention is to produce a pulsator which will run at high speeds without vibration and which is of simple and inexpensive construction.

With this object in view, I have devised a pulsator a practical embodiment of which is shown in. the accompanying drawings in which:

Figure 1 shows a side elevation of the pulsator and its driving motor in connection with a tool operated thereby and Fig. 2 shows a side elevation of the pulsator cylinder partly in section.

The complete mechanism, as shown in Fig. 1, comprises a drill 1, the construction of which forms no part of the present invention, operated by fluid pulsations communicated through a single hose or pressure line 2 from a pulsator 3 directly driven by the motor 4-. The pulsator itself comprises a horizontally split casing which forms two cylinders 5 and 6 in which slide two oppositely reciprocating pistons 7 and 8, these pistons being driven by connecting rods 9 and 10 oppositely and eccentrically secured to the shaft 11. The piston 8 is of the same weight as the piston 7 but performs no active function in the operation of the pulsator serving merely to balance the piston 7 and prevent vibration. The cylinder 5 is provided with a cylinder head 12 to the upper side of which is secured the hose 2 com municating with the tool governed by the pulsator, the tool being operated by the pulsations of air produced in the hose 2 by reciprocations of the piston 7 For the purpose of building up the pres sure in the pulsator cylinder and compensating for leakage loss the following mechanism is provided. Surrounding the open ing through the cylinder head 12 into the hose 2 is a valve 18 which is of the form of a sleeve, the interior diameter of which is the same as that of the hose 2 This valve 13 is constructed to have a short reciprocat-' ing movement in the cylinder head, its travel upwardly being limited by the contact of 1ts upper edge against the lower edge'of the hose 2 and its downward travel being limited by the contact of the flange 14: on the valve with a shoulder 15 in thecylinder head opening. A spring '16 presses against the upper side of the flange l l tending at all times to force the valve 13 to its lowermost position. The upward movement of the valve is caused by a knob or'boss 17 on the upper side of the piston 7 which is adapted to contact with the lower face of the valve 13 near the end of the upper stroke of the piston and move the valve 13 to the upper limit of its travel. To admit outside air to the cylinder 5, to build up the pressure and compensate for the leakage, a check valve is provided which is here shown as an annular plate 18 seating on a shoulder 19 at the upper edge of the cylinder 5 and controlling a series of inlet passages 20 communicating with the outside atmosphere, one of which is shown in Fig. 2. In the head of the piston 7 a ball check valve 21 is provided which allows the pressure between the pistons to build up to a certain extent as the pressure in the cylinder increases.

The operation of the pulsator will be evident from the above description.

The reciprocation of the piston 7 will produce a pulsation of the column of air in the hose 2, which effects the operation of the tool. As the piston moves downwardly, as long as the lower edge of the valve 13 is in contact with the boss 17 on the head of and such a pressure will be maintained subsequently in the pulsator, leakagev being compensated for by a slight addition of out side air constantly taken in through the valve 18. -The dummy piston 8 serves to balance the piston 7 so that the pulsator can be run at high speeds without vibration.

It is to be understood that the present v showing and description discloses only one in the spirit and scope of the invent-ion as specified modification of my invention and other forms and modifications are included expressed in the claims.

What I claim is:

1. In a pulsator for pulsatory tools, a cylinder, its piston, a pressure line for a tool, and valve mechanism for shutting off said pressure line from said cylinder for a portion of the back stroke of said piston, and admitting outside fluid to said cylinder during said portion of the stroke.

2. In a pulsator for pulsatory tools, a cylinder, its piston, a pressure line for a tool, valve mechanism operated by contact With said piston for shutting. off said pressure line from said cylinder for a portion of the back stroke of said piston and means for admitting outside fluid to said cylinder.

3. In a pulsator for pulsatory tools, a cylinder, its piston, a pressure line for a tool having an opening into said cylinder, a sleeve valve surrounding said opening, means to retain said valve in contact with said piston for a portion of the back stroke of said piston, and means for admitting outside fluid to said cylinder.

4. In a pulsator for pulsatory tools, a cylinder, its piston, a pressure line for a tool, having an opening into said cylinder, a sleeve valve surrounding said opening adapted to contact With said piston for a portion of its stroke, means for resiliently holding said valve in contact With said piston, and a check valve for admitting outside fluid to said cylinder.

In testimony whereof, I have hereunto set my hand.

LEl/VIS CONDICT BAYLES.

WVitnesses:

C. S. MILEY, C. H. KRANTZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

